Spring Orm 简明教程

Spring ORM - Persistence EclipseLink

persistence.xml 定义了与 EclipseLink 相关的各种方面，如下所示。

persistence.xml defines the various aspects related to eclipselink like following.

  1. Persistence Unit − A persistence unit containing all the details. It’s name is used to get reference in spring context.

  2. provider − org.eclipse.persistence.jpa.PersistenceProvider class will be used as provider.

  3. Database url and credentials − In properties section, we pass the database related values.

  4. class − to register the class to be persisted.

  5. eclipselink.ddl-generation − to allow eclipselink to create tables.

在 src → main > resources > META-INF 文件夹中创建 persistence.xml。

Create persistence.xml in src → main > resources > META-INF folder.

persistence.xml

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
   http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1">

   <persistence-unit name="EclipseLink_JPA">
      <description> Spring EclipseLink JPA Configuration Example</description>
      <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
      <class>com.tutorialspoint.jpa.entity.Employee</class>
      <properties>
         <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver" />
         <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/tutorialspoint?useSSL=false" />
         <property name="javax.persistence.jdbc.user" value="root" />
         <property name="javax.persistence.jdbc.password" value="root@123" />
         <property name="eclipselink.logging.level" value="FINE"/>
         <property name="eclipselink.ddl-generation" value="create-tables"/>
      </properties>

   </persistence-unit>
</persistence>